P6/H4: Inverter Module Protection - Midea VRF V4 Plus I Series Manual

R410A DC Inverter V4 Plus 50Hz
5.13 P6/H4: Inverter module protection (Display on faulty unit, all the ODU in standby)
If the system display three times P6 protection in 60 minutes, the system will stop and display H4 error code.
When the system displays H4 error code, the system can resume only by restarting the machine. At this time,
malfunction should be disposed promptly to avoid further damage.
H4 will display if P6 occur 3
times in 60 minutes
Check whether inverter
module is broken, and
eliminate the situation that
DC generatrix is connected
inversely
P6 will disappear in one
minute. Then press the
check button to find the
specific error code when P6
appears in the first and
second time. Once H4
appears, the specific error
code cannot be found
through check button
108
L0: module protection
L1: low voltage protection
L2: high voltage protection
L4: MCE error
L5: Zero speed protection
L7: Phase sequence
error
L8: frequency difference
in one second more than
15Hz
L9: frequency difference
between the real and the
setting frequency more
than 15Hz
MCAC-VTSM-2014-04
Check module and
compressor
Check power supply of
module
Check power supply of
module
Check module and
electric circuit
Check electric circuit
and compressor
Check module and
wiring connection
Check compressor
Check compressor
Troubleshooting